myDict = {
    "zhangsan":89,
    "lisi":90,
    "wangwu":77
}
print(f"myDict的值是{myDict},类型是{type(myDict)}")
print(f"{myDict['zhangsan']}")
myDict['zhangsan'] = 33
print(f"myDict的值是{myDict},类型是{type(myDict)}")
# keys打印所有的key值
print(f"{myDict.keys()}")
for x in myDict:
    print(myDict[x])
